* client/authority-discovery: Rework error handling

Instead of `handle_dht_events` returning a `Result<(), Error>`, return
a `Poll<Error>` where `Poll::Pending` signals that there are no more
events to handle and `Poll::Ready(Error)` signals that a fatal error
occured. Non fatal errors are handled within `handle_dht_events`
directly, thus looping in `poll` is not necessary anymore.

* client/authority-discovery: Return () instead of error on termiantion

* Update client/authority-discovery/src/lib.rs

Co-Authored-By: André Silva <[email protected]>

Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: André Silva <[email protected]>

This release includes a fix for an out of bound access that was reported
by one of the validators.

Co-Authored-By: Kian Paimani <[email protected]>

* Temporarily increase notifications buffer size

* Add a 511.0 bucket

* implement iter for doublemap

* fmt

* fix tests

* fix staking mock

* address comment

* update doc and constraint for reversible hasher

Co-authored-by: Gavin Wood <[email protected]>

* Introduce trait

* The trait

* Generic

* Basic impls.

* Remove unneeded bounds

* Minor changes

* Switch over to the new DB trait

* Integrated parity-db and added CLI for db selection

* Default impl.

* Fix logs.

* Started integrating subdb

* Apply suggestions from code review

Co-Authored-By: Cecile Tonglet <[email protected]>

* Apply suggestions from code review

Co-Authored-By: Nikolay Volf <[email protected]>

* Enable subdb

* Bump parity-db

* Fixed CLI macro

* Fixed browser build

* Fixed features

* Sort out features

* Use parity-db from crates.io

* Typo

Co-authored-by: arkpar <[email protected]>
Co-authored-by: Cecile Tonglet <[email protected]>
Co-authored-by: Nikolay Volf <[email protected]>

Co-Authored-By: Bastian Köcher <[email protected]>

* `decl_runtime_apis!` - check that a method without `changed_in` exists

This adds another check to the macro that ensures that not only methods
with `changed_in` exists, but there are also the default methods exist.

* Update primitives/api/proc-macro/src/decl_runtime_apis.rs

Co-Authored-By: Nikolay Volf <[email protected]>

* Fix test

Co-authored-by: Nikolay Volf <[email protected]>

* bumping version

* cargo update

* adding changelog

* Substrate Dashboard example

* Improve README

* Update README_dashboard.md

* Add screenshots

* Minor fix

* Minor fix, image link

* .maintain/sentry-node: Add monitoring to docker-compose stack

With this patch a user can run the following fully configured and
monitored setup with a single command:

`docker-compose -f .maintain/sentry-node/docker-compose.yml up`

- 2 validators in two different network namespaces, connected via one
sentry node.

- Polkadot-js/apps to connect to one of the nodes above.

- Prometheus scraping the 3 Substrate nodes.

- Grafana displaying data from Prometheus with community dashboards

* .maintain/monitoring/grafana: Change default datasource name

* .maintain/monitoring/grafana: Add metric namespace option

* .maintain/monitoring/grafana: Remove `host` metric from most metrics

* .maintain/monitoring/grafana: Remove underscore from metric_namespace

* .maintain/monitoring: Use `instance` label instead of `hostname`

To identify a scrape target, one should use `instance` and not
`hostname` as multiple targets might run on the same node.

See https://prometheus.io/docs/concepts/jobs_instances/ for details.

* .maintain/monitoring: Introduce instance variable

* .maintain/monitoring/grafana: Rename substrate_block_height_number

* .maitain/monitoring/grafana: Use instance instead of host in legend

* .maintain/monitoring: Remove node exporter dependency

* .maintain/sentry-node/prometheus: Simplify configuration

* .maintain/monitoring/grafana: Update README and remove images

* .maintain/sentry-node: Improve docs

* .maintain/monitoring/grafana: Use metric_namespace template variable

* Use --sentry from v0.7.29 instead of a reserved-node

* .maintain/sentry-node: Revert sentry-a using validator-b as bootnode

Co-authored-by: DerFredy - @derfredy:matrix.org <[email protected]>
Co-authored-by: david <[email protected]>

* Add tests for weight refund

* Update frame/system/src/lib.rs

Co-Authored-By: Kian Paimani <[email protected]>

* Fixed formatting

* Format fixes

Co-authored-by: Kian Paimani <[email protected]>

* submit solution for current era

* add test

* address comment

* fix tests

* Give names to channels

* Fix

* A couple more changes

* More minor tweaks

* Fix test

* Bump trie-db

* Bumped version in Cargo.toml

* add fixed128

* fix build

* re-export

* fix test

* saturating_pow

* Update primitives/arithmetic/src/fixed128.rs

Co-Authored-By: Shawn Tabrizi <[email protected]>

Co-authored-by: Shawn Tabrizi <[email protected]>

* More robust ancestry search

* Punish peers for being on the wrong fork

* Update client/network/src/protocol/sync.rs

Co-Authored-By: Bastian Köcher <[email protected]>

Co-authored-by: Bastian Köcher <[email protected]>

* Native version text was borked.

* Unfix benchmarking.

* Fix browser node

* Fix readme

* Make sure we poll authority event stream until all events are processed

* Add test

This refunds weight and the weight bases fee back
to the sender of an extrinsic after the dispatch.

* add pre/post condition check to elections

* Tests for staking

* Better intersection fn

* Fix build

* Add metrics for the events in the network output channels

* Documentation fixes

* A couple fixes

* Fix panic at destruction

* Rework for direct Prometheus integration

* Don't lock on the Receiver

* Another review address

* Address review

* Update client/network/src/service/out_events.rs

Co-Authored-By: Max Inden <[email protected]>

* Fix bad event name

* Fix descriptions

* Fix names

* client/network/service/out_events: Apply remaining suggestions

Co-authored-by: Max Inden <[email protected]>

* Hide benchmarking CLI behind the feature flag

* Add a message

* Update to libp2p 0.18

* Update Cargo.lock

* Also bump in browser-utils

* Initial commit of gitlab pipeline monitoring

* increase max job time

* Improve debug output

* s/PR/issue/

Co-authored-by: Benjamin Kampmann <[email protected]>